Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['I', '5123', '5079', 'y', '4489', '3355']

9, 5123, 5079, 25, 4489, 3355